i had (still have but not working)a iBook G4 1.42 told the story in other posts but to make it short it will play farmville , fishville and all the others but the processor gets a heavy load to work means constant 100% when you play , mine was (still is) in pristine condition , not a single sign of wear when i bought it a couple month ago (payed higher end of your price range , but in british pound near the 300 mark )
but sadly one day it just blew up , logicboard looked like after a nuclear blast ,
i will get one again as i just love the old ppc Macs and to complete my collection i neeed a G4 iBook but until i find one again on ebay where i can say "thats the one "(without cracks and scratches ,which are a good indication most of the time about how well it was looked after)
but for the time until that magic iBook turns up on ebay
i bought a MSI wind netbook in my signature its running OSX snow leopard so is a hackintosh and everything works under snow leopard and plays all the flashgames and plays even youtube without stutter at 480p , and 720p some with a little stutter so yes it is better in that aspect ,the iBook will only manage 360P ,
the wind comes closer to a MacBook Air 1.66 in therms of performance and looks like the little sister of the 13" macbook apart from the hunch on the bottom now as i fitted the 9cell battery which gives a good 5 hours+ and acts as a grab handle (really a handy feature )and makes it quiet comfortable to write on now that its in that angle on the table and gives better cooling too due to more space underneath
but i still would prefer a iBook G4 despite the little drawbacks , just cant help it i love the design of the iBook